DE2523784A1 - BLOW MOLDED DRUM - Google Patents

Description

1 BERLIN 33 8MONCHEN80

Augusfe-Vikioria-Strasse 66 _n DllcAUl / C i DADXMCD PienzenaueretraBe 2

Pat. Dr. Ing.Ruschke LJr. KUOUrINt Ot rAKllNtK Pat -Anw Dipl-Ing

οΕΑΐ? · " ¹ ""· PATENTANWÄLTE ^Ha " ^{s Ε} · **** _mM

Telephone: 030/1 ^ 81 BERLIN - MÖNCHEN ^Telef0n: ""'9872BB

Telegram address: Telegram address:

Quadrature Berlin Quadrature Munich

TELEX: 183786 Munich, the Oo »*. TELEX: 522767

u 1975

our sign A 1514

ADVANCED CHEMICAL TECHNOLOGY, City of Industry / California / VStA.

"Blow molded drum."

The invention relates generally to containers and, more particularly, to a blow molded drum which can be stacked on and off is made of a thermoplastic material.

Drums of this type are known and are designed so that they are one above the other can be stacked to make economical use of space. Such a conventional blow molded drum is comprised for example, a substantially cylindrical main body and a head and bottom portion which are substantially inwardly are tapered with respect to the longitudinal axis of the drum to the required provide structural strength for the container.

The top and bottom portions of this conventional drum terminate

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in generally planar end walls with indentations formed on diametrically opposite sides of the upper end wall are. A tubular portion or protrusion is disposed in each of the recesses and forms one Inlet, outlet or air outlet. Each of the tubular protrusions is associated with the interior of the drum in connection. The upper open edges of the projections terminate in a plane which corresponds to the main plane of the upper wall surface.

Usually there are reinforcement bars in the corresponding recesses provided and formed integrally with the projections and the central portion of the upper end wall to form the projections To impart rigidity and to increase the stability of the entire upper end panel. The reinforcement bars delimit an opening or a cutout section below the upper edges of the projections and ensure that the tubular Approaches are not subjected to any deformation. The projections are also provided with inner peripheral surfaces, which include a threaded portion associated with the threaded portion of a bung or a closure cap is engageable, which normally sealing the tubular projections, the interior being isolated from the environment.

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This type of plastic drum has an eyelet in it Middle section of the upper end wall between the provided Arranged wells. For example, it can be provided in a recess below the main plane of the end wall. This centrally located eyelet takes the hook of a crane or similar lifting device to the drum during to lift or arrange the load or unload vertically.

Loading or unloading a fully filled drum onto or from a truck wing, platform, or other Place with the help of the eyelet and a lifting hook has the inherent disadvantage that during the air transport of the drum through for example a crane, the tension exerted on the drum is excessively high in the region of the eyelet, in particular with drums that have a large volume. It can be seen that as a result of this strain, which is only centered on the eyelet or the eyelet of the drum breakage or loosening of the eyelet from the drum surface can occur, which in turn reduces the completeness affect the drum and lead to extremely dangerous situations.

The barrel shape of conventional plastic drums prevents normal Handling by hand in comparison with the conventional steel

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drum which is substantially cylindrical and relatively has flat top and bottom surfaces and which is easily rolled and placed on a platform of a hoist can be. Also, the top and bottom edges of the steel drums usually have a rolled bead with a annular design which allows a forklift to lift the drum. Plastic drums the in question do not have such well-defined edge portions due to the curvature s rad it at the top and lower sections, and thus these drums are unsuitable for handling by a forklift truck.

Furthermore, due to the strongly curved or rounded head and bottom sections, it is more conventionally barrel-shaped or egg-shaped Plastic drums almost impossible to use a conventional stacker to handle and handle these drums transport. The support forks that extend from the lower end outward of the truck are quite short in length and, as such, usually cannot cover the floor space such trained drums. Even in cases where the curvature of the floor section would allow with the forks gripping the bottom surface of the drum, it is extremely difficult to balance the drum on the stacker again as a result of the generally curved formation of the

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Drum. In addition, there is no handling attachment of any kind left the drum in an unbalanced, relatively unstable position on the conveyor.

It is therefore an object of the invention that in conventional, Blow molded plastic polyethylene drums to bridge the disadvantages encountered and a drum too create which are easily handled both manually and mechanically using conventional lifting devices can be.

According to a preferred embodiment of the invention, a drum has an essentially cylindrical design somewhat curved top and bottom portions which terminate in generally flat end walls.

The drum is made of high-strength thermoplastic material such as polyethylene and blow molded in a conventional manner. In the generally straight peripheral wall The drum adjacent to the upper portion is provided with a pair of indentations or recesses which are diametrically opposed to one another are arranged opposite one another. Every recess creates a generally flat surface that is substantially perpendicular to the longitudinal axis of the drum and parallel to the planes extends upper end walls.

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The purpose of the peripheral wall with such flat stepped Providing indentations consists of supporting surfaces for straight and flat forks of a conventional forklift truck to accomplish. The indentations are designed to support the entire weight of a fully filled drum, and they do not adversely affect the structural strength of the drum. Also as a result is cylindrical Circumferential and flat bottom surface of the drum when placed on the forks or the bottom plate of a trolley is, they are easily balanced against upwardly directed supports of the car, a feature that has so far been due to the rounded Formation of the circumferential surface of conventional plastic drums was impossible.

Furthermore, due to the substantially cylindrical peripheral wall and the slightly curved top and bottom portions of the drum are the edge portions between the peripheral wall and the top and bottom surfaces. Such an edge section on the bottom area of the drum enables that the latter easily rolled by hand and appropriately grasped by the forks or the platform of a forklift and can be arranged there. The degree of curvature at the bottom of the drum is such that the fork is rather short. easy can be arranged under the drum bottom surface, a

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Feature that turn as a result of pretty much practically large curvature of the bottom sections of conventional plastic drums was impossible.

Another feature according to the invention, which in blow molded Drumming was previously unknown, is the handling attachment, which continues to handle and lift the Drum relieved by a forklift truck. The handle attachment is located on the top of the drum and enables the upper section to be connectable to the conventional upper hook with which a transport stacker is is usually equipped to connect the top of the drum to the stacker. The handling attachment can of course also serve to take up the hook or a connecting part of a similar lever device, which uses the hook or link to stabilize the drum on the device.

The handling attachment is provided in one embodiment in the form of a flexible loop that is laterally attached to the Sρundvorsprung on the upper wall of the drum is. The loop is arranged so that it can receive the hook of the transport vehicle.

In another embodiment, the handle attachment is formed by a wall recording, which is something

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angled inward from the flat surface of the top wall the drum extends near its peripheral edge; she forms a cutout between the drum side and the bung projection. When the drum is placed on the forks of the truck is, the cutout portion receives the hook of the stacker.

Further features and advantages emerge from the following explanation of the invention using exemplary embodiments with reference to the attached drawing.
In the drawing show:

Figure 1 is a side view of a blow molded polyethylene drum according to the invention,

Fig. 2 is a partial side elevational view of the drum of Fig. 1 with the top portion of the drum rotated 90 to the handling attachment and the bulge in the wall are clearer to show,

FIG. 3 is a partial plan view of the drum according to FIG. 2, the handling attachment being shown.

FIG. 4 partially shows a side view similar to FIG. 1, but showing a second embodiment of the handling attachment according to the invention,

Fig. 5 is a top plan view of the drum taken along line 5-5 in Fig. 4;

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6 shows an enlarged partial longitudinal section along the line 6-6 in FIG. 5, with the handling attachment is shown in detail,

Pig. 7 is a partial view similar to FIG. 2, with one open at the top Drum is shown with the indentations and the handling attachment according to the invention and

8a and 8b are partial views showing profiles of other embodiments showing the lifting sections of a drum.

With reference to the drawing, in which like reference numerals are used for like parts, and in particular Referring to Fig. 1, there is shown a blow molded drum 10 made of a thermoplastic material such as high density polyethylene. The drum has the is essentially cylindrical in configuration and, as shown, has a generally straight circumference 12 and 12 slightly curved head and bottom sections 14 and 16, respectively, which terminate in generally flat top and bottom end walls 18 and 2o, respectively.

In the peripheral wall of the upper section 14 are nearby the upper end wall 18 two recesses or bulges 22,24 are provided, which are diametrically opposite one another are arranged in the head section 14.

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The recesses 22, 24 initially delimit curved shoulder portions 26, 28 which are quite sharply defined from the straight line P of the projected perimeter 12 inwardly with respect to the longitudinal axis A of the drum C differ. The curved sections 26, 28 are generally straight upright Sections 3o, 32 above which extend upwardly in general alignment with the longitudinal axis A of the drum 1o and themselves extend longitudinally to form elongated channels in the side walls of the drum through which the forks of a forklift truck can be inserted to lift the drum. The sections 3o, 32 in turn end in overhanging projections or lips or forehead sections with flat surfaces 34 »36, which is in a perpendicular plane with respect to the Axis A of the drum 1o extend.

When the straight surfaces 34, 36 of the forks, for example When gripped and lifted on a conventional forklift truck, they create support surfaces for the forks and operate an even and uniform weight distribution of a filled drum.

As shown in the preferred embodiment of Figure 1, the fork insert recesses 22 and 24 are on the upper one Section 14 of the drum is provided. This point for the recesses gives the greatest stability and prevents it from tipping over

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when lifting a fully loaded drum because the The center of gravity of the fully loaded drum is then under the support forks. It should be emphasized that, if desired, additional Recesses in the upper section can be provided to allow the forklift truck to approach from different angles Allow angular positions; the recesses can also be arranged in other drum sections. For example the drum be provided in its middle section with diametrically opposed recesses similar to those, which are designated by 22 and 24. It may also be desirable for the drum to be easily liftable by a forklift truck when placed upside down, and in such a pail the bottom portion of the drum can be opposed to one arranged pair of recesses be provided, which have a training as shown in Fig. 8a, or it can a central portion of the drum may be provided with a pair of recesses formed with top and bottom lifting projections as shown in Fig. 8b.

The flat surfaces of the recesses in the corresponding wall sections are sized, as will be explained later, to prevent them from dislodging from the forks.

Overall, the top and bottom sections 14, 16 have a curvature with a deviation of only a few

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Degrees with respect to the straight sides 12 of the drum. This slight degree of curvature is sufficient to attach the container to the To give top and bottom sections great structural strength.

One advantage of a drum designed in this way is "for example in a substantial increase in the size of the floor area compared to floor sections of drums with a considerably large degree of curvature such as a barrel or egg-shaped drum. The bottom surface of the inventive For example, drum allows effective engagement with the sabers or platform of a conventional one Transport vehicle or forklift and a support on the part of the forks, what with a drum with rather strongly curved Bottom section would not be feasible. As the forks or the platform of a transport device are relatively short in length, they generally do not extend far enough, to reach the bottom of such drums and make them expedient to support. Thus, the small degree of curvature at the bottom section 16 creates a larger support surface for the bottom wall and consequently a larger support surface, for example for the platform of a transport vehicle.

As shown in FIGS. 2 and 3, the top end wall 18 is provided with bung projections 38, 4o conventional training.

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The projections are arranged in recesses 42, 44, the are arranged in the upper end wall 18 diametrically opposite one another. The projections 38, 4o delimit openings, which connect the interior of the drum to the atmosphere, the openings or bung holes being arranged so that they pick up normal bungs or closures.

The top edges of the protrusions 38, 40 are as shown is, arranged in the main plane of the top wall 18, while the upper edges of the »bungs (not shown) in the plane the upper limits of the projections are provided. With this arrangement, the entire top wall 18 is generally flat and increases the stability when stacking the drum on top of each other.

Reinforcement bars 46 (one shown) are on the sides of the Projections 38, 40 are provided and extend inward towards the center of the drum. Below the web 46 or extending through it is a cutout or an eyelet arranged. The eyelet 48 forms an opening for the passage a loop-shaped flexible member 5o, which loosely the bung projection 38 surrounds. The flexible member 5o, for example a flexible wire cable, forms a handling attachment for the drum 1o as it is arranged to

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for example the upper connecting hook of a conventional one Lifting vehicle or the hook of a similar handling device. Such an arrangement is shown in FIG with the hook shown in dashed lines.

In FIGS. 4, 5 and 6, a modified embodiment is shown in FIG Handling attachment according to the invention shown. There the handling attachment is in the form of an attached receptacle 52 is provided, which is open at its upper end. A downwardly directed elongated space 54 is arranged to the upper hook of a transport vehicle or the hook of a similar handling device.

The receptacle 52 is arranged laterally in the region of the peripheral edge 56 of the upper end wall 18 and so that the Walls of the space 54 extend in a slightly outwardly inclined position with respect to the longitudinal axis A of the drum 1o. The · the upper edges 58, 6o surrounding the space 54 extend in a plane which is parallel to the general plane of FIG upper wall 18 lies.

The receptacle 52 is essentially of a substantially wedge-shaped rabbet portion 62 with a bottom portion 64 and an outer wall section 66 is formed. The rebate section is integral with a substantially rectangular bottom section 68 formed, which includes a bung arrangement 7o «

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The bung arrangement 7o, as shown in I ¹ Ig. 6 includes an upper tubular portion 72 and the bottom portion which is integrally formed therewith. The animal sides of the bottom portion 68 include an inner side 74 'facing the center of the drum and an outer side 76 facing away from the center of the drum, with its lower end being integral with the bottom portion 64-. As shown, the outside 76 of the bottom section 68 extends parallel to the outside wall section 66 and angularly inwardly with respect to the axis A of the drum.

Side faces 78, one of which in Pig. 6-6 connect the outer wall portion 66 to the outside 76 of the bottom portion 68.

The bottom portion 68 of the bung arrangement 7o and the wedge-shaped fold portion 62 which is formed integrally therewith form a generally rectangular array when viewed from above or from the ground.

The bung arrangement 7o formed as described above is a prefabricated unit, for example with Is formed using an injection molding process. To place the assembly 7o in the upper end wall of the drum, the assembly initially conveniently arranged in the mold that is used to form the drum, and the latter

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is subsequently around the arrangement 7o by means of a blow molding process educated. It should be emphasized that the arrangement 7o preferably made of a plastic material with a higher melting point than that used to manufacture the drum is used to prevent deformation or melting of the prefabricated arrangement 7o or parts thereof to avoid.

YiTenn the blow molded drum and bung assembly molded into it 7o is removed from the die, the drum is provided with an elongated, generally rectangular opening formed, which is provided in the upper wall 18 and in which the bung arrangement is conveniently arranged. the A generally rectangular wall 84 is provided delimiting opening 82 and is comprised of wall sections 86, 88, 9o and a side wall portion 92 is formed into the side wall 14 of the drum passes.

The outer peripheral surface of the bottom portion 68 and the Fold portions 62 are provided with an integral peripheral rib portion 98, and as a result of blow molding the The drum around the arrangement 7o is the peripheral surface of the drum wall 84 with a corresponding peripheral section 1oo educated; these two sections, i.e., rib section 98 and section 100 of drum wall 84 are

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interlocking with each other, as shown in FIG. 6 is shown. Also, after the drum has been blow molded, the apex 1o2 of the folded portion 62 is in abutment engagement with it an abutment surface 94 of a stop section 96, which at the transition area at the lower end of the wall section 92 and the side wall H of the drum is formed. Such a system creates a reinforcement effect for the fold section 62 and the wall section 92 in the area of the abutment section 96.

Uniform with the upper drum wall portion 86 of the wall and the central section 1o4 of the drum surface 18, a reinforcing web 1o6 is provided to increase the rigidity of the bung arrangement 7o to support and avoid deformation.

The bung arrangement 7o is provided with an inner annular peripheral wall 1o8 provided, which at its lower end with a threaded portion 11o, which is provided with a corresponding threaded portion 112 of a general bung 114 engaged in the assembly 7o is provided. Directly above the threaded portion 11o is an inwardly tapered portion 116, which rests tightly against a seal 1o8 which an inner tapered surface portion 12o of the bung is provided. This arrangement creates an effective

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Sealing the inside of the drum. A sealing cap 122 is provided on the assembly 7o to prevent the bung 114 from being accidentally or surreptitiously removed.

As shown in Figure 5, the space 54 has a width substantially equal to the diameter of the tubular portion 72 of the bung assembly 7o, the width being such that there is adequate access for the upper hook a conventional transport device is created.

In Pig. 7, there is shown an open top, blow molded plastic drum 10 'which is normally covered by a lid or a Cover member 124 is closed. The drum in this embodiment is similar in appearance to the drum Fig. 1 formed. The drum 10 ′ has a uniform lateral projection 126 on its upper section 14 ′ which extends radially outward. The projection 126 is provided with an eyelet or opening 128 which has a Passage for the handling attachment 13o creates, which in Fig. 1 in the form of a loop-shaped flexible member such as a loop-shaped wire 50 ' that picks up the hook of a lifting device. The upper surface 132 of the projection 126 lies in the main plane of FIG upper end wall 134. The barrel configuration of this embodiment is identical to its opposite of FIG not further explained.

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For example, the location and dimensions of the scope of the embodiments described are such that, as shown in I ¹ Xg. 5, the overhanging projection of a recess has its flat lifting surface in such a way that it occupies an area which is delimited between a chord G of the circumference of the drum and the corresponding arch which spans the chord. The longitudinal dimension of the projection, which corresponds to the length of the chord C, encloses an angle of approximately 62 at A. The depth of the overhanging protrusion is at least 12.7 mm and preferably about 19.0 to 38.1 mm in order to provide convenient support for the forks of a forklift truck and to allow for variations in fork spacing so as to insure that the lifting protrusion does not fails and that the forks do not slide off. The upright portions of the recesses are approximately 38.1 mm high to allow for a reasonable initial misalignment in the height or angle of the forks of the forklift, such as may occur when the forklift is approaching on an inclined or uneven pavement.

The upright sections of the recesses can be slightly outward or be curved inward. This enables the forks of a lifting device to be arranged in the recesses be facilitated, such as in such cases if the forks are not exactly parallel to each other

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stretch. In addition, those that are somewhat outwardly curved provide support upright sections the rigidity of the entire recess construction. An outward curvature the upright portion is shown by the broken line in Fig. 5, for example.

The foregoing description discloses the purpose of the present invention so that those of ordinary skill in the art will appreciate various Recognizes applications without leaving out various features, which, compared to the prior art, form essential properties of the proposal according to the invention. Leave it appropriate changes or modifications are carried out, However, without departing from the essence of the invention.

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Claims (22)

Expectations 1.) Blow-molded drum made of thermoplastic material, characterized in that an elongated drum body is provided with a peripheral wall and top and bottom portions, the peripheral wall being at least two one-piece having overhanging end portions which are arranged correspondingly on opposite sides of the peripheral wall of the body are that each of the end portions overhangs a corresponding free and open space in the vicinity of the peripheral wall, which is sufficiently large to allow the forks of a forklift truck to be inserted below the overhanging end sections to allow, and that the overhanging end sections have bottom surfaces which are designed so that they can be used as support and lifting surfaces are used to lift and transport the drum. 2.) Drum according to Claimi, characterized in that the end portions are arranged in the peripheral wall of the body in the vicinity of the upper part of the drum body and substantially at the same distance above the bottom of the body. 3.) Drum according to claim 1, characterized in that the peripheral wall is generally cylindrical and slightly veriünate Has head and bottom sections. S098S0 / 0380 4.) Drum according to claim 1, characterized in that the free and open seams are delimited by two bulges in opposite sides of the peripheral wall of the body, that each of the lobes is elongated to define elongated channels in the peripheral wall through which the Forks of a forklift truck can be used, and that the overhanging end portions the corresponding overhanging Include head portions of the longitudinal channels. 5.) Drum according to claim 1, characterized in that the overhanging end portions at their deepest portion have a depth of at least 12.7 mm. 6.) Drum according to claim 5 »characterized in that each of the overhanging end sections at its deepest section has a depth in the range of 12.7 to 38.1 mm. 7.) Drum according to claim 5, characterized in that the free and open space below an overhanging front section has a height of approximately 38.1 mm. 8.) Drum according to claim 1, characterized in that the bottom surfaces of the overhanging Stirnabschtiittes plane Are surfaces which are substantially perpendicular to the axis of the drum and that the peripheral wall is longitudinal extending upright wall sections immediately below 509350/0380 the bottom surfaces of the overhanging end sections and associated therewith includes. 9.) Drum according to claim 8, characterized in that the drum body includes a handling member which is connected to the head of the drum and located near the peripheral wall is ο 1o.) Drum according to claim 9 »characterized in that the handling attachment is a loop made of flexible Comprises material attached to the drum body. 11.) Drum according to claim 1, characterized in that the handling attachment a cap-like receptacle comprises, which is made in one piece in the plastic of the head of the Drum is formed. 12.) Drum according to claim 1, characterized in that the bottom portion of the drum body has a surrounding the bottom Includes band wall, and that the head portion of the drum body has an open top which can accommodate a matching plastic lid. 13 ·) Drum according to claim 4> characterized in that the indentations are at the same distance from and in the · Extend near the top end wall. 5098S0 / 0380 14 ·) Drum according to claim 9 »characterized in that the head and bottom portions include head and bottom end walls of the body, at least one depression on one side the top end wall and further a tubular projection include what access to the interior of the Body permitted and arranged in the recess. 15 ·) Drum according to claim 14 »characterized in that the tubular projection integral with the recess in the flat surface on the head portion of the body is formed, and that the drum further includes reinforcing webs which are integral with the planar surface and the tubular extension and bridge the recess. 16.) Drum according to claim 14, characterized in that the handling member of a loop made of flexible material is formed, which is in operation with one of the tubular projections in engagement. 17 ·) Drum according to claim 14> characterized in that the handling member is designed in the form of a receptacle which is formed by a wall portion which is arranged radially outwards and at a distance from the tubular projection and a space in the recess in the area 509850/0380 the peripheral edge "is limited, and that the space is inwardly extends to the body. 18.) Drum according to claim 17, characterized in that the peripheral edge has a laterally outwardly directed projection includes, which has an opening for the passage limited by the loop made of flexible material. 19 ·) Drum according to claim 15, characterized in that the tubular projections are provided with an inner peripheral surface and screw threads in the surface, and that the Screw threads are engageable with the screw threads of a shut-off member in the tubular projection is provided to seal the latter from the atmosphere. 2o.) Drum according to claim 14 »characterized in that the Handling member can accommodate the hook of a hand truck. 21.) Drum according to claim 14> characterized in that the handling member for manual and mechanical handling of the Drum is suitable, and that this handle member laterally from an end wall on the upper part of the body next to the tubular projection is arranged. 503850/0380 22.) Drum according to claim 14 »characterized in that the handling element for manual and mechanical handling the drum is suitable, and that this G-lied at the top free edge of the head portion of the body movably attached is. 509850/0380 Blank page